Writing instrument



FIG. 1 is a perspective view of the front and left side of a writing instrument, according to a first aspect of the invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side perspective view thereof;

FIG. 5 is a right side perspective view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the front and left sides of a writing instrument according to a second aspect of the invention;

FIG. 9 is a front elevational view thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a left elevational view thereof

FIG. 12 is a right elevational view thereof;

FIG. 13 is a top elevational view thereof; and,

FIG. 14 is a bottom elevational view thereof. 

The ornamental design for a writing instrument, as shown and described. 